Review
Environmental Sciences
Huiling Xia, Chengwei Li, Guoying Yang, Zhiang Shi, Chenxi Jin, Wenzhi He, Jingcheng Xu, Guangming Li
Summary: This paper provides a detailed classification and comprehensive review of microwave-assisted advanced oxidation processes (MW-AOPs) in wastewater treatment. The latest applications of microwave in different advanced oxidation systems are discussed, along with the discussion of reaction parameters, performance, and operating costs of MW-AOPs. Recommendations for future research on MW-AOPs are also provided, highlighting the potential development and evolution of this technology.
Article
Environmental Sciences
Hannah Milh, Xingyue Yu, Deirdre Cabooter, Raf Dewil
Summary: In this study, the efficiency of UV-based sulfate radical advanced oxidation processes (SR-AOP) and UV-based advanced reduction processes (ARP) in degrading ciprofloxacin (CIP) in wastewater was investigated. It was found that the UV/PS process was more efficient than the UV/PMS process in SR-AOPs, while the UV/sulfite process was the most efficient among ARPs. The optimal process parameters and the contribution of different reactive species were determined for each process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Yi-di Chen, Xiaoguang Duan, Xu Zhou, Rupeng Wang, Shaobin Wang, Nan-qi Ren, Shih-Hsin Ho
Summary: Advanced oxidation processes are effective in disinfection and microbial inactivation in water treatment, utilizing various reactive oxygen species to destroy pathogens with high efficiency and powerful purification capabilities.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Analytical
Lin Minyi, Xia Dehua
Summary: Advanced oxidation processes based on sulfate radicals are promising technologies for inactivating pathogenic microorganisms in water and wastewater due to their high oxidation potential, wide pH adaptability, and negligible formation of undesired byproducts.
ENVIRONMENTAL CHEMISTRY
(2022)
Review
Biochemistry & Molecular Biology
Christian Schoneich
Summary: Oxidation is a major route of chemical degradation in pharmaceutical formulations, but the mechanisms behind oxidation reactions, particularly the generation of free radicals, are not well understood. This article focuses on formulating these mechanisms based on information about impurities and stress factors from manufacturing, transportation, and storage. It specifically explores autoxidation, metal-catalyzed oxidation, photo-degradation, and radicals generated from cavitation due to mechanical stress, highlighting probable pathways rather than theoretical possibilities.
Review
Engineering, Environmental
Alena Kulist'akova
Summary: The majority of current wastewater treatment technologies are ineffective in removing pharmaceutical micropollutants, resulting in their discharge into surface water bodies and causing significant harm to fragile ecosystems. The European Commission has published an expansion of legislation for surface water that includes the monitoring and limitation of the discharge of nine pharmaceuticals. Photochemical advanced oxidation processes (AOPs) have shown promise in efficiently removing micropollutants and could potentially reduce the pharmaceutical burden in wastewater. However, there are challenges that limit their widespread use in treatment plants. This review fills the gap in summarizing and assessing the current trends in the utilization of photochemical AOPs for pharmaceutical micropollutant removal in wastewater treatment, representing the first attempt to address this topic.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Review
Engineering, Chemical
P. V. Nidheesh, G. Divyapriya, Fatima Ezzahra Titchou, Mohamed Hamdani
Summary: This article extensively discusses various aspects of sulfate radicals based advanced oxidation processes (SR-AOPs) in treating textile wastewaters, including activation processes, reactive molecules and radicals species, performance evaluations, comparisons with other AOPs, and studies on experimental scales.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Review
Engineering, Environmental
Golnoosh Khajouei, Harry O. O. Finklea, Lian-Shin Lin
Summary: Advanced oxidation processes (AOPs), including UV/chlorine, have gained attention as alternatives to conventional water treatment technologies. UV/chlorine process offers multiple disinfection modes and maintains chlorine residuals, while also having advantages like higher radical production efficiency. This process has been applied to degrade a wide range of organic and inorganic compounds. This review evaluates the efficiency of UV/chlorine process and discusses strategies to tackle the formation of disinfection by-products (DBPs).
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Li Li, Qi Han, Li Wang, Bei Liu, Kunkun Wang, Zhongying Wang
Summary: Peroxymonosulfate (PMS) based advanced oxidation processes (AOPs) have shown high efficiency in removing organic pollutants in wastewater. This study found that single layer MoS2 can effectively activate PMS, leading to excellent degradation performance. Sulfate radical (SO4 center dot- ) and hydroxyl radical (center dot OH) were identified as the primary reactive oxygen species (ROS). In addition, 2H-MoS2 nanomaterial exhibited better degradation performance and aligned stacks of MoS2 nanosheets enhanced the removal capacity.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Engineering, Environmental
Yaobin Ding, Libin Fu, Xueqin Peng, Ming Lei, Chengjun Wang, Jizhou Jiang
Summary: This review analyzes and summarizes the generation mechanisms of various reactive species in the Cu/persulfate system, discusses the role of copper ions and copper oxides in the formation of these species, and provides guidelines for future research and engineering applications of persulfate.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Pham Cam Nam, Nguyen Minh Thong, Nguyen Thi Hoa, Duong Tuan Quang, Loc Phuoc Hoang, Adam Mechler, Quan V. Vo
Summary: The study systematically evaluated the radical scavenging activity of FX and found it to have moderate activity against various radicals in different environments. FX showed promising scavenging activity against HOO center dot in the gas phase but lower activity in physiological environments. Its antioxidant activity falls behind typical antioxidants under the studied conditions.
Article
Engineering, Environmental
Yu Lei, Yafei Yu, Xin Lei, Xi Liang, ShuangShuang Cheng, Gangfeng Ouyang, Xin Yang
Summary: Advanced oxidation processes (AOPs) are widely used for water and wastewater treatment. This study determined second order rate constants for reactions between probes and quenchers with various reactive species and chemical oxidants. Previously ill-quantified reactions were found to be favorable. The improved kinetic database and proposed criteria for probe and quencher selection and dosing will benefit future research in AOPs and other radical-involved reactions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Long Chen, Jun Duan, Penghui Du, Weiliang Sun, Bo Lai, Wen Liu
Summary: This study presented a comprehensive identification of radicals in four typical UV-based homogeneous AOPs using in-situ EPR analysis. The radical formation mechanism was clarified based on the EPR results. A reliable EPR method was proposed to identify alkoxy and alkyl radicals in the UV/PAA system, and the addition of specific organic solvents effectively identified oxygen-center and carbon-center radicals.
Review
Chemistry, Physical
Puthiya Veetil Nidheesh, Clement Trellu, Hugo Olvera Vargas, Emmanuel Mousset, Soliu Oladejo Ganiyu, Mehmet A. Oturan
Summary: Combination of electro-Fenton process with other advanced oxidation processes is effective for water and wastewater treatment. These combined processes can enhance the mineralization efficiency and reduce operational cost and toxicity of treated wastewater. However, they also present challenges such as increased side reactions and energy requirements.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Review
Engineering, Environmental
P. V. Nidheesh, Ashitha Gopinath, N. Ranjith, Apurva Praveen Akre, Vandana Sreedharan, M. Suresh Kumar
Summary: Biochar has gained extensive research attention in advanced oxidation processes due to its multifunctional role; pyrolysis is the most commonly used method for acquiring desired properties, and biochar can function as a catalyst, support material, and cathode material due to its high conductivity and porous structure; research focuses on activation mechanisms, ROS generation, sulfate radical mediated degradation, and future directions in the field.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Li Zhang, Hongcen Zheng, Yonghai Gan, Bingdang Wu, Zhihao Chen, Shuangshuang Wei, Guoyang Zhang, Shujuan Zhang, Bingcai Pan, Chuncheng Chen
Summary: This article introduces a novel method for the synthesis and functionalization of gold nanoparticles using acetylacetone. The size of the nanoparticles can be controlled by adjusting light intensity and acetylacetone dosage. The capping role of acetylacetone allows for stable dispersion in water without changes in morphology and photochemical properties. Additionally, the nanoparticles can be used as imaging probes through reactions with other substances.
Article
Environmental Sciences
Zhihao Chen, Meiqing Chen, Kok Yuen Koh, Wenyang Neo, Choon Nam Ong, J. Paul Chen
Summary: This study developed a CaO2-functionalized wet alginate bead for simultaneous removal of phosphorus and inhibition of algae growth, demonstrating promising potential for the management of harmful algal blooms. The bead showed stable H2O2 release and efficient removal of phosphorus in water, as well as long-lasting inhibition of algae growth, outperforming other traditional methods. This functionalized material also proved effective in removing algae in realistic water samples.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Sujie Shan, Zhihao Chen, Kok Yuen Koh, Wei Wang, Jiayu Wu, J. Paul Chen, Fuyi Cui
Summary: In this study, a new nano-sized lanthanum peroxide composite (LPC) was developed for the simultaneous oxidation and adsorption of arsenite. The LPC demonstrated rapid oxidation and adsorption kinetics, high selectivity, and superior adsorption capacity for arsenite, outperforming many reported adsorbents. Both arsenite and arsenate in simulated arsenic-polluted reservoir waters were effectively removed.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Li Zhang, Hongcen Zheng, Bingdang Wu, Yonghai Gan, Guoyang Zhang, Shujuan Zhang
Summary: The photo-reduction of highly toxic selenite (Se(IV)) to insoluble elemental selenium (Se(0)) using acetylacetone (AcAc) and diacetyl (BD) as reductants was studied. The two diketones were found to be more effective and robust than sulfite, with higher reduction rate constants and no need for deoxygenation. The recovery rates of Se(0) in the UV/AcAc and UV/BD systems were 82% and 75%, respectively, after 1 hour of irradiation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Shuangshuang Wei, Chang Zhou, Guoyang Zhang, Hongcen Zheng, Zhihao Chen, Shujuan Zhang
Summary: Organoarsenical antibiotics pose a severe threat to the environment and human health. In aquatic environment, dissolved organic matter (DOM)-mediated photochemical transformation is one of the main processes in the fate of organoarsenics. The presence of acetylacetone significantly enhances the photochemical conversion of roxarsone.
Article
Chemistry, Multidisciplinary
Jianghua Yang, Wenguang Huang, Wentao Zhang, Kunrui Wei, Bingcai Pan, Shujuan Zhang
Summary: Immobilization of enzymes within metal-organic frameworks can enhance their long-term usability, but it often leads to a trade-off between stability and activity. This study shows that the trade-off can be solved by controlling defects through competitive coordination. The biocomposites collected before recrystallization exhibit increased activity and enhanced stability.
Article
Engineering, Environmental
Chengyang Zhang, Guoyang Zhang, Jiyuan Jin, Hongcen Zheng, Zhiwei Zhou, Shujuan Zhang
Summary: The coexistence of selenite (Se(IV)) and acetylacetone (AA) have a synergistic effect on the growth inhibition of Microcystis aeruginosa, which is significant in the control of harmful algal blooms. Se(IV) acts as a catalyst in the reactions between AA and quinones, leading to accelerated reactions. This finding sheds light on the regulation of electron transport chains and redox balances in various processes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Li Gong, Jingting Chen, Yao Hu, Kai He, Eric J. Bylaska, Paul G. Tratnyek, Feng He
Summary: This study developed a method of simultaneous sulfidation and nitridation of zerovalent iron (ZVI) through mechanochemical ball milling, which improved the degradation of chloroform (CF). The composite material (S-N(C)-ZVI) exhibited synergistic effects of nitridation and sulfidation on CF degradation. Material characterizations showed that sulfidation and nitridation promoted the formation of Fe3O4 on the S-N(C)-ZVI particles.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Anna Wang, Ben-Zhan Zhu, Chun-Hua Huang, Wei-Xian Zhang, Mengye Wang, Xuchun Li, Li Ling, Jun Ma, Jingyun Fang
Summary: Peroxymonosulfate (PMS) is a widely-used disinfectant and oxidant that reacts with chloride (Cl) to generate singlet oxygen (1O2). The mechanism of 1O2 formation from PMS and Cl interaction was confirmed, and the oxygen atoms in 1O2 were found to come from the peroxide group of PMS. 1O2 showed higher yield and played important roles in microplutant degradation and DNA damage, but it also posed potential risks to human health.
Article
Chemistry, Physical
Jianghua Yang, Zewen Ji, Shujuan Zhang
Summary: Defects were introduced in carbon nitride (CN) by adjusting the ratio of acetylacetone (AcAc) and urea. The resulting modified CNs (AxCN) with dual defects (C doping and surface -OH modification) exhibited higher photocatalytic production rate and selectivity of H2O2, attributed to the synergistic roles of the dual defects in oxygen reduction reactions. This finding provides insights into defect engineering for environmentally friendly generation of H2O2.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Environmental Sciences
Hongcen Zheng, Bingdang Wu, Guoyang Zhang, Tianyu Xie, Zhihao Chen, Shujuan Zhang
Summary: Redox transformation is a useful strategy for reducing metal oxysalts toxicity and facilitating their removal from water. The synergistic effect in the redox transformation of coexisting oxyanions was evaluated using different processes, and the UV/AcAc process was found to be highly effective in oxidizing As(III) and reducing Cr(VI) without the need for additional treatment. This UV/AcAc process consumed significantly less electric energy compared to the sum of UV/H2O2 and UV/sulfite, making it a promising advanced oxidation and reduction process (AORP).
Review
Chemistry, Inorganic & Nuclear
Wentao Zhang, Wenguang Huang, Bingdang Wu, Jianghua Yang, Jiyuan Jin, Shujuan Zhang
Summary: Metal-organic frameworks (MOFs)-mediated photocatalysis is a promising solution to address energy shortage and environmental pollution. Significant progress has been made in the modification strategies for improving the photocatalytic performance of MOFs, as well as in understanding the mechanisms, such as the excitonic effect. This work critically reviews the excitonic effects in charge transfer and energy transfer processes, summarizes common techniques for characterizing excitonic effects, discusses strategies for regulating excitonic behaviors, and provides insights into the current challenges and future perspectives of MOFs-mediated photocatalysis for energy conversion and environmental remediation.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Engineering, Environmental
Jiajia Fan, Jianwei Zeng, Xuchun Li, Kaiheng Guo, Wang Liu, Jingyun Fang
Summary: The combination of UV and KMnO4 is a promising advanced oxidation process for treatment of cyanobacterial blooms. It can effectively inactivate cyanobacterial cells, degrade microcystins, and remove cells without additional coagulants. The synergistic effect of UV/KMnO4 treatment is attributed to the highly oxidative species produced during UV photolysis of KMnO4.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Analytical
Han Cao, Ania S. Pavitt, Jeffrey M. Hudson, Paul G. Tratnyek, Wenqing Xu
Summary: This study uses square-wave voltammetry (SWV) and mediated chronoamperometry (MCA) to determine the electron-exchange capacity (EEC) of pyrogenic dissolved organic matter (pyDOM). SWV gives larger EEC values than MCA, making it suitable for measuring the EEC of natural organic matter and pyDOM.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2023)